效果：
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提示：保存到PHP文件然后在浏览器中打后即可看到和效果图一样的一张图片。
$im=imagecreate(670,500);
$white = imagecolorallocate($im,0xFF,0xFF);
$g = imagecolorallocate($im,0x00,0x00);
define("PII",M_PI/180);
function drawLeaf($g,$x,$y,$L,$a){ global $im;
$B = 50;
$C =9;
$s1 = 2;
$s2 = 3 ;
$s3 = 1.2;
if($L > $s1)
{
$x2 = $x + $L * cos($a * PII);
$y2 = $y + $L * sin($a * PII);
$x2R = $x2 + $L / $s2 * cos(($a + $B) * PII);
$y2R = $y2 + $L / $s2 * sin(($a + $B) * PII);
$x2L = $x2 +$L / $s2 * cos(($a - $B) * PII);
$y2L = $y2 + $L / $s2 * sin(($a - $B) * PII); $x1 = $x + $L / $s2 * cos($a * PII);
$y1 = $y + $L / $s2 * sin($a * PII);
$x1L = $x1 + $L / $s2 * cos(($a - $B) * PII);
$y1L = $y1 + $L / $s2 * sin(($a - $B) * PII);
$x1R = $x1 + $L / $s2 * cos(($a + $B) * PII);
$y1R = $y1 + $L / $s2 * sin(($a + $B) * PII); ImageLine($im,(int)$x,(int)$y,(int)$x2,(int)$y2,$g);
ImageLine($im,(int)$x2R,(int)$y2R,(int)$x2L,(int)$y2L,(int)$x1,(int)$y1,(int)$x1L,(int)$y1L,(int)$x1R,(int)$y1R,$g); drawLeaf($g,$x2,$y2,$L / $s3,$a + $C);
drawLeaf($g,$x2R,$y2R,$L / $s2,$a + $B);
drawLeaf($g,$x2L,$y2L,$a - $B);
drawLeaf($g,$x1L,$y1L,$x1R,$y1R,$a + $B);
}
}
drawLeaf($g,300,500,100,270);
header("Content-type: image/png");
imagepng($im);
?>
